Lukewarm water in bathtub/shower...

The water coming out of the bathtub faucet is lukewarm at best, unless someone flushes the toilet for me while I'm in there. :D

I can get hot water out of the sink faucet, and I can get hot water in other parts of the house. It's been a gradual change. I noticed it was a little cool a few weeks ago, but chalked it up to other things (running laundry etc.)

The bathtub faucet operates with one knob that turns from hot to cold, and it's been installed at least 10 years. I've never replaced any parts, so I'm hoping that's where the problem is.

Any ideas? I'd like to have a clue about what's causing the problem even if I do end up calling a plumber.

Since you have hot water, either you have a tempering valve that is malfunctioned and admitting cold water, or you have a worn single handle faucet that does the same. Search tempering valve so you understand what this is. If you have one, it is the problem. Otherwise, faucet repair or replacement time.

LonnythePlumber

04:44AM | 02/21/05

You probably need to adjust the temperature limiting stop in the handle of your valve. This stop keeps the hot water from coming all the way on. In cooler seasons the incoming cold water into the structure is colder resulting in a cooler mix from these faucets.